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In this case, have you tried setting up the monitors at the Intel® HD Graphics Control Panel?
Right click on the desktop and clink on Intel® Graphics Settings and then click on display.
Once you are on the display screen you can choose what monitor will be on the right or on the left.
One will be the primary and the other monitor will be the secondary monitor.
Please let me know if that helps, if not I will be more than glad to further investigate for you.